# Copyright (C) 2014-2024 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

"""
SVN commit module
"""
import logging
import dateutil.parser
from zope.cachedescriptors.property import Lazy as LazyProperty

from rhodecode.lib.str_utils import safe_bytes, safe_str
from rhodecode.lib.vcs import nodes, path as vcspath
from rhodecode.lib.vcs.backends import base
from rhodecode.lib.vcs.exceptions import CommitError
from vcsserver.lib.vcs_common import NodeKind, FILEMODE_EXECUTABLE, FILEMODE_DEFAULT, FILEMODE_LINK
_SVN_PROP_TRUE = "*"

log = logging.getLogger(__name__)


class SubversionCommit(base.BaseCommit):
    """
    Subversion specific implementation of commits

    .. attribute:: branch

       The Subversion backend does not support to assign branches to
       specific commits. This attribute has always the value `None`.

    """

    def __init__(self, repository, commit_id):
        self.repository = repository
        self.idx = self.repository._get_commit_idx(commit_id)
        self._svn_rev = self.idx + 1
        self._remote = repository._remote
        # TODO: handling of raw_id should be a method on repository itself,
        # which knows how to translate commit index and commit id
        self.raw_id = commit_id
        self.short_id = commit_id
        self.id = f"r{commit_id}"

        self.nodes = {}
        self._path_mode_cache = {}  # path stats cache, e.g filemode etc
        self._path_type_cache = {}  # path type dir/file/link etc cache
        self.tags = []

    @property
    def author(self):
        return safe_str(self._properties.get("svn:author"))

    @property
    def date(self):
        return _date_from_svn_properties(self._properties)

    @property
    def message(self):
        return safe_str(self._properties.get("svn:log"))

    @LazyProperty
    def _properties(self):
        return self._remote.revision_properties(self._svn_rev)

    @LazyProperty
    def parents(self):
        parent_idx = self.idx - 1
        if parent_idx >= 0:
            parent = self.repository.get_commit(commit_idx=parent_idx)
            return [parent]
        return []

    @LazyProperty
    def children(self):
        child_idx = self.idx + 1
        if child_idx < len(self.repository.commit_ids):
            child = self.repository.get_commit(commit_idx=child_idx)
            return [child]
        return []

    def _calculate_file_mode(self, path: bytes):
        # Note: Subversion flags files which are executable with a special
        # property `svn:executable` which is set to the value ``"*"``.
        if self._get_file_property(path, "svn:executable") == _SVN_PROP_TRUE:
            return FILEMODE_EXECUTABLE
        else:
            return FILEMODE_DEFAULT

    def get_file_mode(self, path: bytes):
        path = self._fix_path(path)

        if path not in self._path_mode_cache:
            self._path_mode_cache[path] = self._calculate_file_mode(path)

        return self._path_mode_cache[path]

    def _get_path_type(self, path: bytes):
        if path in self._path_type_cache:
            return self._path_type_cache[path]

        if path == b"":
            self._path_type_cache[b""] = NodeKind.DIR
            return NodeKind.DIR

        path_type = self._remote.get_node_type(self._svn_rev, path)

        if not path_type:
            raise self.no_node_at_path(path)

        #flags = None
        self._path_type_cache[path] = path_type
        #self._path_mode_cache[path] = flags

        return self._path_type_cache[path]

    def is_link(self, path: bytes):
        # Note: Subversion has a flag for special files, the content of the
        # file contains the type of that file.
        if self._get_file_property(path, "svn:special") == _SVN_PROP_TRUE:
            return self.get_file_content(path).startswith(b"link")
        return False

    def is_node_binary(self, path):
        path = self._fix_path(path)
        return self._remote.is_binary(self._svn_rev, safe_str(path))

    def node_md5_hash(self, path):
        path = self._fix_path(path)
        return self._remote.md5_hash(self._svn_rev, safe_str(path))

    def _get_file_property(self, path, name):
        file_properties = self._remote.node_properties(safe_str(path), self._svn_rev)
        return file_properties.get(name)

    def get_file_content(self, path):
        path = self._fix_path(path)
        return self._remote.get_file_content(self._svn_rev, safe_str(path))

    def get_file_content_streamed(self, path):
        path = self._fix_path(path)

        stream_method = getattr(self._remote, "stream:get_file_content")
        return stream_method(self._svn_rev, safe_str(path))

    def get_file_size(self, path):
        path = self._fix_path(path)
        return self._remote.get_file_size(self._svn_rev, safe_str(path))

    def get_path_history(self, path, limit=None, pre_load=None):
        path = self._fix_path(path)
        history = self._remote.node_history(self._svn_rev, safe_str(path), limit)
        return [self.repository.get_commit(commit_id=str(svn_rev)) for svn_rev in history]

    def get_file_annotate(self, path, pre_load=None):
        result = self._remote.file_annotate(safe_str(path), self._svn_rev)

        for zero_based_line_no, svn_rev, content in result:
            commit_id = str(svn_rev)
            line_no = zero_based_line_no + 1
            yield line_no, commit_id, lambda: self.repository.get_commit(commit_id=commit_id), content

    def get_node(self, path: bytes, pre_load=None):
        path = self._fix_path(path)

        # use cached, if we have one
        if path in self.nodes:
            return self.nodes[path]

        path_type = self._get_path_type(path)
        if path == b"":
            node = nodes.RootNode(commit=self)
        else:
            if path_type == NodeKind.DIR:
                node = nodes.DirNode(safe_bytes(path), commit=self)
            elif path_type == NodeKind.FILE:
                node = nodes.FileNode(safe_bytes(path), commit=self, pre_load=pre_load)
                self._path_mode_cache[path] = node.mode
            else:
                raise self.no_node_at_path(path)

        self.nodes[path] = node
        return self.nodes[path]

    def get_nodes(self, path: bytes, pre_load=None):
        if self._get_kind(path) != nodes.NodeKind.DIR:
            raise CommitError(f"Directory does not exist for commit {self.raw_id} at '{path}'")
        path = self._fix_path(path)

        path_nodes = []
        for name, node_kind in self._remote.get_nodes(self._svn_rev, path):
            obj_path = vcspath.join(path, name)

            if node_kind is None:
                raise CommitError(f"Requested object type={node_kind} cannot be determined")

            # TODO: implement it ??
            stat_ = None
            # # cache file mode
            # if obj_path not in self._path_mode_cache:
            #     self._path_mode_cache[obj_path] = stat_

            # cache type
            if node_kind not in self._path_type_cache:
                self._path_type_cache[obj_path] = node_kind

            entry = None
            if obj_path in self.nodes:
                entry = self.nodes[obj_path]
            else:
                if node_kind == NodeKind.DIR:
                    entry = nodes.DirNode(safe_bytes(obj_path), commit=self)
                elif node_kind == NodeKind.FILE:
                    entry = nodes.FileNode(safe_bytes(obj_path), commit=self, mode=stat_, pre_load=pre_load)
            if entry:
                self.nodes[obj_path] = entry
                path_nodes.append(entry)

        path_nodes.sort()
        return path_nodes

    def _get_kind(self, path):
        path = self._fix_path(path)
        path_type = self._get_path_type(path)
        return path_type

    @LazyProperty
    def _changes_cache(self):
        return self._remote.revision_changes(self._svn_rev)

    @LazyProperty
    def affected_files(self) -> list[bytes]:
        changed_files = set()
        for files in self._changes_cache.values():
            changed_files.update(files)
        return list(changed_files)

    @LazyProperty
    def id(self):
        return self.raw_id

    @LazyProperty
    def added_paths(self):
        return [n for n in self._changes_cache["added"]]

    @LazyProperty
    def changed_paths(self):
        return [n for n in self._changes_cache["changed"]]

    @LazyProperty
    def removed_paths(self):
        return [n for n in self._changes_cache["removed"]]


def _date_from_svn_properties(properties):
    """
    Parses the date out of given svn properties.

    :return: :class:`datetime.datetime` instance. The object is naive.
    """

    aware_date = dateutil.parser.parse(properties.get("svn:date"))
    # final_date = aware_date.astimezone(dateutil.tz.tzlocal())
    final_date = aware_date
    return final_date.replace(tzinfo=None)